如何将数据放入android上的MySql DB中

Question

我想让我的android应用程序发送ping请求，并将往返时间存储在脱机数据库中。 ping部分有效，但是在数据库中存储数据不起作用。

作为一个例子，我使用了静态参数：

public void upload(Context context)
{    


    String rtt = "4.4";
    String location = "4.4";
    String TAG = "MyActivity"; 
    try {


        HttpClient httpclient = new DefaultHttpClient();

        HttpPost httppost = new HttpPost("http://somesite.com);

    ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("6.2", rtt));
    postParameters.add(new BasicNameValuePair("6.3", location));

    httppost.setEntity(new UrlEncodedFormEntity(postParameters));                   
    HttpResponse response = httpclient.execute(httppost);
    Log.i("postData", response.getStatusLine().toString());
 }

我希望这会在以下php脚本中上传这些参数。 PHP又将这些值存储在mysql数据库中（我希望）

<?php

$con = mysqli_connect("localhost","****","******","DB");

if (mysqli_connect_errno())
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
    //you need to exit the script, if there is an error
    exit();
}
mysqli_select_db($con,"stats");

$rtt = $_POST['rtt'];
$location = $_POST['location'];

mysqli_query("INSERT INTO stats (rtt, location) VALUES ('$rtt','$location')");

mysqli_close($con);
?>

不可否认这不起作用。我不知道在哪里查找日志，apache错误和访问日志除了以外不提供太多信息：

[2014年6月18日：22：15：31 +0200]＆＃34; POST /sql.php HTTP / 1.1＆＃34; 500 231＆＃34; - ＆＃34; ＆＃34; Apache-HttpClient / UNAVAILABLE（java 1.4）＆＃34;

至少消息正在进入。我应该在哪里寻找更多信息？我不确定是否将正确的信息发送到php网站。

我已使用以下php文件进行测试：     

$con = mysqli_connect("localhost","USER","PASS", "DB");

if (mysqli_connect_errno())
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
    //you need to exit the script, if there is an error
    exit();
}
mysqli_select_db($con,"stats");

$rtt = $_POST['rtt'];
$location = $_POST['location'];

mysqli_query($con, "INSERT INTO stats (rtt, location) VALUES ('0.5','2.5')");

mysqli_close($con);
?> 

此信息将添加到数据库中。